Mounts all needed mount points to change into another system from within a live-CD

mount-root

#!/bin/bash
# mounts all needed mount points to change into another system from within a live-CD

#-------------- Author:  -------------#
# by Ruben Barkow (Rubo77)


if [ "$(whoami &2>/dev/null)" != "root" ] && [ "$(id -un &2>/dev/null)" != "root" ] ; then
	echo "You must be root to run this script!"; echo "use 'sudo !!'"; exit 1
fi

if [ $1 = "-i" -o $1 = "--interactive" ]; then
	#interactive
	tmp=$(mktemp)
	IFS=
	eval dialog --menu \"Please choose a partition:\" 50 50 10 $(lsblk -f | sed -r 's/^/"/;s/$/" " "/' | tr $'\n' ' ') 2>$tmp
	D=$(tr -d '│├└─' < $tmp | sed 's/^[ \t]*//' | cut -d' ' -f1)
	
	read -p "mount /dev/$D to /var/tmp/$D? [yN] " -n 1 -r
	echo    # (optional) move to a new line
	if [[ $REPLY =~ ^[YyJj]$ ]]; then
		# do dangerous stuff
		$0 /dev/$D /var/tmp/$D
	fi
	exit
fi

if [ $# -ne 2 ]; then
	# --help
	echo "------------------------------"
	(set -x
	fdisk -l
	lsblk -f
	)
	echo "------------------------------"
	echo "DESCRIPTION:

    this script mounts all needed mount points to change into another system
    from within a live-CD
    
  GLOBAL OPTIONS:
    
    Mandatory arguments to long options are mandatory for short options too.
    
    -i, --interactive
        select the partition in an interactive interface
    -h, --help 
        Display output of fdisk and lsblk and this help documentation
  
  USAGE EXAMPLES:
    
    calling this script with only two options with the device and mountpoint
    
    # mounting the partition /dev/sda1 into /media/other/ and chroot into it
    mount-root /dev/sda1 /media/other/
    
  DEVELOPER INFO
  
    requires the packages dialog and cut

    This procect on git: https://gist.github.com/rubo77/eac3313ea5302acfca60
"
	exit
fi

D=$(echo $1 | sed 's:/$::')
M=$(echo $2 | sed 's:/$::')

echo mounting $D to $M

mkdir -p $M

mount $D $M
mount -t proc none $M/proc
mount --bind /dev $M/dev
mount -t sysfs sysfs $M/sys
mount --bind /dev/pts $M/dev/pts
cp /proc/mounts $M/etc/mtab
echo chrooting now...
chroot $M/ /bin/bash

select_device

#!/usr/bin/env bash
# lets you select a partition with dialog

#-------------- Author:  -------------#
# by Ruben Barkow (Rubo77)
# git: 		https://gist.github.com/rubo77/eac3313ea5302acfca60

tmp=$(mktemp)
IFS=
eval dialog --menu \"Please choose a partition:\" 50 50 10 $(lsblk -f | sed -r 's/^/"/;s/$/" " "/' | tr $'\n' ' ') 2>$tmp
D=$(tr -d '│├└─' < $tmp | sed 's/^[ \t]*//' | cut -d' ' -f1)
printf "You chose:\n%s\n" "$D"